Abstract:
Steel/FRP composite materials have been used in the manufacture of solid rocket motor shell,but still no effective and reliable method for non-destructive testing.Ultrasonic guided wave testing is more promising.For the changing situation of FRP material parameters, according to the kinetic theory of elasticity, the propagation characteristics of ultrasonic guided wave in the pipeline was analyzed.The dispersion curves for a given material parameters were calculated firstly, determined the guided wave detection mode for the composite.And then calculated the dispersion curves changes of the selected mode group velocity based on the fluctuation range of FRP Poisson's ratio, density, elastic modulus and the thickness of the material parameters.The final results of the analysis showed that within the detection frequency range, the group velocity of
L(0,2) mode decreases with the increase of the material Poisson's ratio, density and thickness, increases with the increase of the elastic modulus of the material at the same frequency.